- Narrow, fully sealed construction
- Oil tempered carbon steel torsion spring
- Zinc plated variable pitch spiral
The Whitco Window Spiral Balance 380 suits timber or aluminium double-hung windows in the 2.25-7.25kg sash weight range and is supplied with the standard foot attached. It gives smooth, balanced sash movement, with spring tension adjustable to suit the application.
The spiral is held by a zinc diecast fixing plug inside a tough ABS polymer outer casing, and shock-absorbing stops are built in.